Time travel and both people are living at the same time for extended periods of time. Don't know if that is possible.

If the writers are going to make up something like time travel they've already thrown the rule book out the window. I don't think Aaron is Ben, but if they're going to have something impossible like time travel they can do anything they want with it.The BBC program Life On Mars has a character who seems to be simultaneously back in 1973 (where he woke up after being hit by a car in 2006) and in 2006 (where he's in a coma from being hit by a car). In one episode he sees himself as a child walking to a footy match with his father. Granted, that show hasn't fully explained whether the 1973 portion is his 2006 coma dream, but it seems to be both real and a dream.

I think the big thing is here is that since Ben said that he was not the only one born on the island and everyone else need some assurance that they can leave, does this mean that he cant leave, which would also mean that Aaron cant leave.

Wow!! How did I miss that being mentioned? I must be slacking and need to spend more time at SWLS!! So, what do the stones mean? Is it a gift of "rights" to the big-boy's club? Kind of like how the Masons were so secretive, so they created different ways to identify other members without having to ask them.

Some claim, the black and white stones (seen on Adam and Eve) are on the table in Desmond's flat. ("Flashes Before Your Eyes") However, these "stones" are likely the bottle caps from Desmond's beer bottles rather the rocks Jack finds on "Adam and Eve."